Parity violation in $\vec np\to d\gamma$ at LANSCE

The longitudinal asymmetry $A_\gamma$ in photons emitted during radiative neutron-proton capture depends cleanly on the neutral current contribution to the weak nucleon-nucleon interaction. The NPDGamma experiment is an effort to measure this asymmetry with precision $1\times 10^{-8}$, which is 10\% of its range of predicted values. A pulsed beam of polarized slow neutrons is incident on a 16\,L parahydrogen target; capture photons are observed in current mode in a cylindrical array of CsI scintillators. In 2006 the NPDGamma collaboration acquired its first production dataset at the Los Alamos Neutron Science Center. In 730 hours running with 50--55\% neutron polarization, photons from some $2\times 10^{14}$ captures were observed. At present the collaboration is engaged in analysis of these data and in relocation of the apparatus to the Spallation Neutron Source, where the increased neutron flux will permit measurement of $A_\gamma$ to the design precision. I will describe the 2006 run and report on the status of the current efforts.